C20XE Freeze Plug Diameter

[jfgw]

All,

 

Engine went in today and ran fine until one of the freeze plugs started to leak. Before ordering replacements, I wanted to double-check the size. Does anyone know? I am googling but not having much luck.

 

Thanks

James

[bsimon]

GM corporate usually uses imperial measurements for freeze plugs, regardless the country of origin. I'd take a stab at the C20XE having 1 3/8" freeze plugs (Dorman 555-025). For a couple of bucks at Checker, it'd be worth a go.

 

Yank off the zorst and pull the exhaust primary that's in front of the offending plug. Pop it out with a lag screw, washer, and a large socket. Take it down to the auto parts store and they'll be able to match it up.

 

Beating the new one in will be a chore. Take care not to dimple the side skin on the back swing.